The Sirius Cybernetics Corporation sells teleporting equipment. In order to increase sales, they sell their basic service at a 15% loss. They know, however, that few people teleport economy and they sell the upgrades at a hefty profit of 35%. What is the ratio between the total sales of basic services and the total sales of upgrades at which the company breaks even?

(entity from Douglas Adams' "Hitchhiker's Guide to the Universe")

The break even occurs when the losses equal the gains to result in zero profit.